Wolf Hunter

2008 TL on 3rd new battery. Drain occurs if it sits more than 24 hours. After that, it's completely dead. I did an extensive search which led to possible Bluetooth causing the drain. However, I have removed it completely and the battery drain still occurs. I have owned this car for about 3 years now, and never had an issue y til about 4 months ago. I have to keep the cat on the battery charger if it sits longer that a day. I have taken it to a local shop who tested the battery/alternator. They advised that everything is fine. Took it to another shop and they told me the same thing. Any ideas? Am I missing something?

Will Y.

Did the shop test the drain at the fuse blocks?

Do you have any aftermarket audio, alarm, remote start or iSimple?
If yes, start with those.

A/C or other relays going bad can cause a drain as well.

Welcome to AZ.

Wolf Hunter

Nothing aftermarket installed. Both shops said they couldn't find anything that would cause the draw.

Will Y.

How do you know there is a drain on the battery, as opposed to having a dying starter or bad ignition switch?

If the shop(s) checked for a draw at the fuse blocks (not at the battery or alternator), they should be able to detect and isolate whatever is causing the draw.

Otherwise, you may have a defective battery with a dead cell.

Wolf Hunter

Yeah I'm not sure how or what they exactly checked. I know the battery isn't bad since I'm on my 3rd one in 4 months. That what both shops (including) Acura kept telling was the issue.

Jonney07

Are you sure they checked out the alternator correctly. maybe try one more shop and see what they say.

TLer trash

I have heard of at least two people who mistakenly disconnected the sunroof/courtesy light module, thinking it was the HFL module.